Yeeco Wall Flat US Plug LCD Digital Voltmeter Volt Panel Meter Voltage Tester Gauge AC 80-300V 110V 220V Voltage Measuring Monitor volt Monitoring Measure Measurement Household Camper voltage tester AC 110V 220V Flat US Plug LCD Digital Voltmeter Volt Panel Meter Voltage Tester Simple design with 2 prongs US plug; just connected the meter to wall socket directly LCD display and soft blue backlight, easily view the data even in dim atmosphere Multi function; This tester can be used as voltage meter and also as a night light With potentiometer which is built inside of the device for accuracy adjustment